Your ability to "see" the traffic can be limited by your expectation of where to look.
The landing pilot was possibly not aware that the departing aircraft was operating from the former helipad as he is not looking in that direction. He may have been looking at the new facility to sight the departing helo as he would have heard the departing helo's radio call. The pax tapping him on the shoulder is the last hole to line up as he no longer has the opportunity to sight the departing helo in his peripheral vision. Not the pax fault and not the pilot's fault.